<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body{
            margin: 0;
        }
        .muea{
            display: block;
            padding: 5px;
        }
    </style>
</head>
<body>
    <div style="background-color: bisque;height: 48px;color: aquamarine">
        管理页面
    </div>
    <div style="position: absolute;top: 48px;bottom: 0;left: 0;width: 200px;background-color: chocolate">
        <a class="muea" href="/user_info/">用户管理</a>
        <a class="muea" href="/user_guoup/">用户组管理</a>
    </div>

</body>
</html>